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3,9-dihydroxy-[1]benzoxolo[3,2-c]chromen-6-one 3,9-dihydroxychromeno[4,3-b]benzofuran-6-one 3,9-dihydroxy-chromeno[4,3-b]benzofuran-6-one 3,9-dihydroxy-[1]benzofuro[3,2-c]chromen-6-on 3,9-dihydroxy-[1]benzofuro[3,2-c]chromen-6-one 3,9-ジヒドロキシ-[1]ベンゾフロ[3,2-c]クロメン-6-オン
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